Download Magnetic Sensors, Volume 5, Sensors: A Comprehensive Survey by Richard Boll, Kenneth J. Overshott PDF

By Richard Boll, Kenneth J. Overshott

'Sensors' is the 1st self-contained sequence to accommodate the total quarter of sensors. It describes normal features, technical and actual basics, development, functionality, functions and advancements of a few of the kinds of sensors. This quantity provides for the 1st time a finished description of magnetic sensors with particular emphasis positioned upon technical and medical basics. It presents vital definitions and a different evaluate of suggestions, and the character and rules of magnetic fields. normal questions touching on all kinds of magnetic sensors, similar to these touching on fabric, noise, and so on. are handled. every one bankruptcy includes actual and mathematical basics and utilized technical techniques. furthermore, each one bankruptcy provides an summary of an important functions, size levels and accuracy of sensing and so forth. This quantity is an essential reference paintings and textual content booklet for either experts and rookies, researcher and builders.

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The electromagnetic induction equation can be then used to calculate the peak flux density, B, in Tesla, for the specific area of search coil, A in m2, when the flux is changing at a frequency off in Hz . 44 - B, A N * f . 5 Movement of Domain Boundaries 39 One has to make sure carefully that the impedance of the search coil does not load the measuring system. However, the search coil, being the most simple magnetic sensor, has many advantages and, in fact, whole careers in magnetism have been founded upon its extensive use [lo].

Biomagnetism; Berlin, New York: de Gruyter, 1981. [24] Williamson, S. , “Biomagnetism”, J Magn. Magn. Mat. 22 (1981) 129-201. , Dauermagnete. Werkstoffe und Anwendungen; Heidelberg: Springer, 1970. , Permanent Magnets in Theory and Practice; Plymouth: Pentech Press, 1977. [27] Parkinson, D. , Mulhall, B. , The Generation of High Magnetic Fields; London: Plenum Press, 1967. : Experimental Methods in Magnetism. , 1967. [29] Montgomery, D. , Solenoid Magnet Design, New York: Wiley-Interscience, 1969.

Figure 3-7. Vertical Hall device (see also Figure 3-5 h). The bias current Z flows between the two peripheral contacts, each carrying a half of the current (1/2), and the central contact. The Hall voltage appears between the two sense contacts SC, and SC,. 3 Performances Sensitivity: In modulating transducers, such as Hall sensors, absolute and relative sensitivities can be distinguished. Absolute sensitivity of a Hall sensor is defined as: S, = I 8UH/i3BI I = Const (in V/T = Volt/Tesla) . (3-49) 58 3 Magnetogalvanic Sensors - - However, since in a Hall-effect device U, BZ and UH BU, (see Equations (3-34) and (3-37), a more useful feature is its relative sensitivity.

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